Holderlin/Bob,
you didn't give any other info re. the squeezebox other than you are using it to play MP3 files. I'm *assuming* that the bluntness & lack of rhythm is when you play MP3 files from the Squeezebox.
Well, you are aware that MP3 is a lossy file compression format, correct? when you compress your music files to MP3 you are going to lose a lot of info. Does the MP3 format give you an bit rate option? If so, did you select the highest bit rate allowed?
If not, then I have a feeling that you have a system that is able to inform you that the MP3 format has lost much/some info in your music files.
The Cary plays redbook CDs that are in .wav format, a lossless format.
If the Squeezebox allows some other lossless format, you can try that.
IMHO. FWIW.